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 I think NVK means don’t use a general purpose computer for your keys, use away for running a bitcoin node or electrum sever like Start OS would support. 
 What about lightning node ?  
 Well that’s not really an apples to apples comparison. When talking purely about signing device functionality, a purpose built embedded device may provide better security than a general purpose computer. A lightning node is more than just a signing device; you need more compute, memory and an internet connection (this last part being a big differentiator).